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   <TITLE>Controls - A multi-check ListBox</TITLE>
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A multi-check ListBox
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This article was contributed by <A HREF="mailto:hdevine@geocities.com">Harry J. Devine</A>.

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<IMG SRC="multichecklistbox.jpg" width="283" height="236" alt="CMultiCheckListBox example">&nbsp;
Download <A HREF="multichecklistbox_src.zip">Source Code</a> and 
<A HREF="multichecklistbox_demo.zip">Example project</A>
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<p>
I had a desire/requirement on a recent project to have a CCheckListbox class that allowed for
more than one checkbox in front of the string.  The 3-state style set by the CCheckListbox
simply didn't do what I wanted or needed.  I had a list of people who could fall into 2 different
categories at the same time.  The 3-state style told me that this person fell into one category,
but I had to just know WHICH one. 

<p>So, I decided to write a class that extended the capabilities of the CCheckListbox.  What I
came up with was the <b> CMultiCheckListBox </b> class.  What it does is add another checkbox
in front of the original checkbox in the CCheckListbox implementation. <br><br>

<p>To use the class, follow these steps:<br>
<ul>
<li>Add a member variable to the desired class (CDialog, CFormView, etc.) <br>
            <pre><tt><font COLOR="#990000"> CMultiCheckListBox m_List; </font></tt></pre>
<li>Subclass the list box variable just created.<br>
            <pre><tt><font COLOR="#990000">
 void CCharityReportDlg::DoDataExchange(CDataExchange* pDX)
 {
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CCharityReportDlg)
    DDX_Control(pDX, IDC_LIST1, m_List);
    //}}AFX_DATA_MAP
 }
            </font></tt></pre>
<li> To set the first checkbox for listbox item <i>nIndex</i>, call SetCheck(nIndex, nCheck)
             <pre><tt><font COLOR="#990000"> m_List.SetCheck(nIndex,1); </font></tt></pre>
<li> To set the second checkbox, call SetMultiCheck(nIndex, nCheck)
	     <pre><tt><font COLOR="#990000"> m_List.SetMultiCheck(nIndex,1); </font></tt></pre>
<li> To retrieve the checkbox state of the first checkbox, call GetCheck(nIndex)
	     <pre><tt><font COLOR="#990000"> m_List.GetCheck(nIndex); </font></tt></pre>
<li> To retrieve the checkbox state of the second checkbox, call GetMultiCheck(nIndex)
	     <pre><tt><font COLOR="#990000"> m_List.MultiGetCheck(nIndex); </font></tt></pre>
</ul>

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<p>Last updated: 4 July 1998

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